One of the major problems that the United States faced during the Twentieth Century was the race of all people. Many people in the United States did not get along with others that were not of their same race which led to many problems.
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Portuguese settlled in the American colonies during the seventeenth and eighteenth centuries. 70% of Portuguese immigrants to the United States came from the Azores, while most of the remainder came from the other Portuguese islands in the Atlantic. Most of the emigrants from mainland Portugal went to Brazil, although the more recent immigration to the United States during the middle of the twentieth century has originated from mainland Portugal
Inflation was fairly flat in the United States during most of the 1800s. A dollar from almost any time during that century would be have the purchasing power of about 4 cents today.
Automobiles.
Yes, only the United States has sent successful manned missions to and have set foot on the Moon. All missions that have resulted in a manned landing on the Moon were conducted through the Apollo Program. From 1967 to 1969, the Soviet Union attempted several manned missions to the Moon, but ultimately all of them failed.
European powers divided China into spheres of influence, while the United States promoted an Open Door Policy.