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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.
Major European powers fought to keep independent states from unifying
The Discovery of Pennicillin
British and European were the 2 main immigrant groups. This was back in the 18th century.
The budget.
Spain, England and France were the European countries that established major colonies in the United States.
France, Spain and the UK
the Dutch Republic
The urban problems that developed in the 19th century included drinking as well as poor living conditions.
Trading was a major factor of European economies in the 16th and 17th century, Europe did not have everything they needed and would trade with nations to get it.
economic crash terrorism immigration