The 20th century was a time of  dramatic change in American life. The beginning of the 21st century seems like  a good time to look back over the last 100 years to see how the United States  has done in the meantime, or worse.
                               At the beginning of the 20th  century, the American people benefited from this trade and faced challenges.  Low-cost production and production have made many products possible. Rail  networks are crazy, many of which are being introduced across the country due  to new technologies. Montgomery Ward, JC Penney, and other partners have  expanded their business and laid the foundation for a consumer-led approach  that began at the end of this century. In material terms, the lives of city  dwellers have grown not only in food, shelter, housing, and other necessities  but also in  health and education.  Cheap books, magazines, newspapers, and social media, with the help of Andrew  Carnegie Charity, have helped them become more imaginative. Sexual satisfaction  is still important, and family life also reflects a spirit of love. More petite  movies and professional sports can fill your leisure time. The Boy Scouts and  the Girl Scouts were established in 1908 and 1910 to allow children to enjoy  their education.
                               To make the best use of natural  resources, human and economic resources, the government has made significant  improvements in corporate governance by establishing a fund, providing more  hospitality, raising funds, and enforcing laws. Darwin's human rights  activists, "the strongest survivors," and laissez-faire supporters,  advocate for the temporary independence of the state and represent the  suffering of workers based on race, ethnicity, or gender.
                               The post-war alliance with the  Soviet Union was shattered at the end of 1945, reviving the communist fears  expressed in the 1920's red flags. Dean Acheson and Gen. George C. Marshall)  accused them of defending terrorists. Externally, its goal is to expand Soviet  rule in Eastern Europe and Asia. The possibility of a nuclear war between the  United States and the Soviet Union prompted the Civil Defense Agency to erect  billboards in private homes, highlighting the collapse and encouraging  homeowners to build houses. In the decades that followed, conflicts with the  Soviet Union and communist China threatened the American people's lives,  especially as the United States led the United Nations to ban communist  development in North Korea (1950-53), "police" required the  deployment of almost all groups. Troops of the Soviet Union. 1.8 million,  destroying more than 33,000 Americans, unsupported by the American people;  especially in the Vietnam War (1964-75), when the United States tried to  prevent the North Vietnamese Communist government from taking over South  Vietnam, but to no avail. Other issues, such as the establishment of satellites  by the Soviet Union in 1957 and the Cuban naval crisis in 1962, have  exacerbated the controversy.
                               As the pressure to join the  Allies intensified, the United States' efforts to survive the First World War  (taking place in Europe since 1914) were thwarted. In April 1917, at the  request of President Woodrow Wilson, Congress declared war on Germany. Wilson's  goal of "bringing down the world to democracy" and fighting the  "war to end all wars" was widely accepted, either by publishing a report  from a press committee or by a progressive ideology. Manufacturing equipment  means a lot of work, but a shortage of food and fuel limits customer choice.  Germans were tortured. About 10% of South Africans in the south live there —  they move to northern cities in search of work, dignity, and freedom; many find  low-paying jobs, but respect and space are limited. Many Americans supported  the war by purchasing free ties. Three million people were registered, out of a  total of 4,791,172 people. Among them are 370,000 black men who work in various  groups and want to do so. 
                               Challenge group. The second force  is the growing US economic growth, a natural result of the corporate economy.  This becomes obvious everywhere. For example, a decision-making process that is  not uncommon among all populations is transformed by the belief that more  participation will be more effective. Although self-confidence, connectivity,  and commitment seem to be social norms, misunderstandings, confusion, and  ambiguity seem acceptable now. Relying on critical thinking when dealing with  problems is replaced by the belief that mindfulness also helps participate.  Continuity continues to be appreciated, but there are concerns about its value  and its realization.
                               The changes in the family structure  reflected the difficulties at the time. The 1990 census reported that the size  of the family was petite, mainly due to low birth weight, and single-parent  families had risen to one-fourth of the family. More than a quarter of children  in the United States have single parents, twice the population in 1970. The  divorce rate reached a peak of 5.3 per 1,000 people in 1981 due to changes in  the divorce law. Despite the slight decline in subsequent years, few people  expect prices to return to the 1950s. As more couples remarry, there are more  and more families, including stepchildren, so that these families are no longer  considered strangers. Co-living outside the family circle is becoming more and  more popular.
                               Some of the previous trends were  reversed in the 1990s. For example, although the birth rate of young unmarried  mothers increased from the 1960s to the early 1990s, it began to decline in the  late 1990s due to illness.
                               Changing the family model is  complex. It is not uncommon to often sit around a table and eat, but there are  more and more cases of eating out and running. The emergence of multiple TVs in  many households and the proliferation of TV channels have made it difficult for  family members to watch TV together. Stereo headsets and video and computer  games played by others can interfere with family communication. As more and  more women use it outside, the demand for childcare is growing exponentially.  The cost and difficulty of obtaining quality care hinder parents' choice.
                               Members of the younger generation  find themselves experiencing special events that affect many people: their  parents live longer than previous generations. Even if the parents are alone,  their children will meet their needs. It is difficult and cheap to provide care  when it is not possible to live independently. The longevity of the elderly  (including the youngest of the offspring) means that the elderly constitute an  essential part of the population. Because many older people are in poor health,  they need medical attention. Due to social security, medical insurance, and  funding, the number of older people living in poverty has declined. Through  organizations such as the American Association of Retired Persons (AARP), the  elderly have political power.
                               Other trends in population growth  will help rebuild the United States in the second half of this century. One of  the things that happened was the rapid urbanization of the Sunbelt  states—especially in Florida, Arizona, Nevada, and California—and continued  urbanization. The other is different from the migration method. In the first  two decades of this century, more than 86% of the population came from Europe,  4% came from Latin America, and 3% came from Asia; between 1980 and 1996, less  than 11% came from Europe, 35% came from Asia, and 50% came from Latin America.
                             Minorities; The third category,  socially and politically, belongs to the affiliated groups of victims of  racism. Although these groups developed in the 1980s and 1990s, they found that  politics was less important in what they did than decades ago. On the contrary,  the government during Ronald Reagan's presidency also changed some of the  original interests of minority groups. These groups subsequently faced  challenges in the courts and the state. At the same time, ethnic minorities and  women accounted for an equal proportion of the poor, and they did not share the  rich's wealth in the late 1990s. The difference between rich and poor should be  the subsequent legacy of the past decade.