The military budget of the United States in 2011 was more than $700 billion, 41% of global military spending. At 4.7% of GDP, the rate was the second-highest among the top 15 military spenders, after Saudi Arabia. Defense spending plays a major role in science and technology investment, with roughly half of U.S. federal research and development funded by the Department of Defense. Defense's share of the overall U.S. economy has generally declined in recent decades, from Cold War peaks of 14.2% of GDP in 1953 and 69.5% of federal outlays in 1954 to 4.7% of GDP and 18.8% of federal outlays in 2011.
The United States, with its large size and geographic variety, includes most climate types. To the east of the 100th meridian, the climate ranges from humid continental in the north to humid subtropical in the south. The Great Plains west of the 100th meridian are semi-arid. Much of the Western mountains have an alpine climate. The climate is arid in the Great Basin, desert in the Southwest, Mediterranean in coastal California, and oceanic in coastal Oregon and Washington and southern Alaska. Most of Alaska is subarctic or polar. Hawaii and the southern tip of Florida are tropical, as well as its territories in the Caribbean and the Pacific. States bordering the Gulf of Mexico are prone to hurricanes, and most of the world's tornadoes occur in the country, mainly in Tornado Alley areas in the Midwest and South. Overall, the United States has the world's most violent weather, receiving more high-impact extreme weather incidents than any other country in the world.
More InfoGovernment policy designed to promote affordable housing, widespread failures in corporate and regulatory governance, and historically low interest rates set by the Federal Reserve led to the mid-2000s housing bubble, which culminated with the 2008 financial crisis, the nation's largest economic contraction since the Great Depression. Barack Obama, the first African-American and multiracial president, was elected in 2008 amid the crisis, and subsequently passed stimulus measures and the Dodd–Frank Act in an attempt to mitigate its negative effects and ensure there would not be a repeat of the crisis. In 2010, the Obama administration passed the Affordable Care Act, which made the most sweeping reforms to the nation's healthcare system in nearly five decades, including mandates, subsidies and insurance exchanges.
More InfoThe 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.
More InfoThe United States is a federal republic of 50 states, a federal district, five territories and several uninhabited island possessions. It is the world's oldest surviving federation. It is a federal republic and a representative democracy, "in which majority rule is tempered by minority rights protected by law." For 2018, the U.S. ranked 25th on the Democracy Index. On Transparency International's 2019 Corruption Perceptions Index its public sector position deteriorated from a score of 76 in 2015 to 69 in 2019.
More InfoIn 2018, there were almost 90 million immigrants and U.S.-born children of immigrants (second-generation Americans) in the United States, accounting for 28% of the overall U.S. population. The United States has a very diverse population; 37 ancestry groups have more than one million members. White Americans of European ancestry (mostly German, Irish, Mexican, and English), form the largest racial group, at 73.1% of the population; African Americans constitute the nation's largest racial minority and third-largest ancestry group, and are around 13% of the total U.S. population. Asian Americans are the country's second-largest racial minority (the three largest Asian ethnic groups are Chinese, Filipino, and Indian).
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