The United States has operated under a two-party system for most of its history which is in stark contrast to its Canadian neighbor. For elective offices at most levels, state-administered primary elections choose the major party nominees for subsequent general elections. Since the general election of 1856, the major parties have been the Democratic Party, founded in 1824, and the Republican Party, founded in 1854. Since the Civil War, only one third-party presidential candidate—former president Theodore Roosevelt, running as a Progressive in 1912—has won as much as 20% of the popular vote. The president and vice president are elected by the Electoral College.
The United States fought Indian Wars west of the Mississippi River from 1810 to at least 1890. Most of these conflicts ended with the cession of Native American territory and their confinement to Indian reservations. This further expanded acreage under mechanical cultivation, increasing surpluses for international markets. Mainland expansion also included the purchase of Alaska from Russia in 1867. In 1893, pro-American elements in Hawaii overthrew the monarchy and formed the Republic of Hawaii, which the U.S. annexed in 1898. Puerto Rico, Guam, and the Philippines were ceded by Spain in the same year, following the Spanish–American War. American Samoa was acquired by the United States in 1900 after the end of the Second Samoan Civil War. The U.S. Virgin Islands were purchased from Denmark in 1917.
More InfoIn a 2014 survey, 70.6% of adults in the United States identified themselves as Christians; Protestants accounted for 46.5%, while Roman Catholics, at 20.8%, formed the largest single Christian group. In 2014, 5.9% of the U.S. adult population claimed a non-Christian religion. These include Judaism (1.9%), Islam (0.9%), Hinduism (0.7%), and Buddhism (0.7%). The survey also reported that 22.8% of Americans described themselves as agnostic, atheist or simply having no religion—up from 8.2% in 1990.
More InfoThe government is regulated by a system of checks and balances defined by the U.S. Constitution, which serves as the country's supreme legal document. The original text of the Constitution establishes the structure and responsibilities of the federal government and its relationship with the individual states. Article One protects the right to the "great writ" of habeas corpus. The Constitution has been amended 27 times; the first ten amendments, which make up the Bill of Rights, and the Fourteenth Amendment form the central basis of Americans' individual rights. All laws and governmental procedures are subject to judicial review and any law ruled by the courts to be in violation of the Constitution is voided. The principle of judicial review, not explicitly mentioned in the Constitution, was established by the Supreme Court in Marbury v. Madison (1803) in a decision handed down by Chief Justice John Marshall.
More InfoAmerican forces in Iraq were withdrawn in large numbers in 2009 and 2010, and the war in the region was declared formally over in December 2011. But months earlier, Operation Neptune Spear led to the death of the leader of Al-Qaeda in Pakistan. In the presidential election of 2016, Republican Donald Trump was elected as the 45th president of the United States. On January 20, 2020, the first case of COVID-19 in the United States was confirmed. As of August 2020, the United States has over 5.5 million COVID-19 cases and over 170,000 deaths. The United States is, by far, the country with the most cases of COVID-19 since April 11, 2020.
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