1. First of all, the United States did not catch up with the first industrial revolution from the beginning of the industrial revolution (19 started in Europe in the 1940s), but caught up with the last bus of the second industrial revolution (19 started in the 1960s). By the end of the 20th century, the industrial output value of the United States had ranked first in the world. The third industrial revolution broke out in the United States (starting in the 1940s), and the United States has been at the forefront of science and technology ever since. Science and technology are the primary productive forces. The two world wars and the subsequent cold war provided a broad global market for products made in the United States. Wealth keeps flowing from Europe into the United States, making it a new center of wealth and power in the world. By the end of World War II, the GDP of the United States was 10 times that of the United Kingdom, and the gold reserve was $20 billion, accounting for almost two-thirds of the world total (about $33 billion). Therefore, the strength of the United States 1945 can only be described as "extraordinary", which is unprecedented.

Politically, America has never experienced a feudal society. The separation of powers since the founding of the People's Republic of China is the most complete and thorough capitalist regime. When President Lincoln was in office, the civil war broke out in the United States (65438+60' s). The industrial capitalism representing the north defeated the serfdom in the south, and the whole country truly realized political unity and market unity, clearing the way for the development of capitalism.

3. Economic system: In the early days, the United States completely pursued liberal capitalism, with all resources regulated by the market and rapid economic development. Until the economic collapse and Great Depression in 1930s, the United States learned a lesson, strengthened government intervention in the market, and improved the economic system (Roosevelt's New Deal).