In 1854, the Missouri Compromise was repealed by the Kansas-Nebraska Act. Three years later the Missouri Compromise was declared unconstitutional by the Supreme Court in the Dred Scott decision, which ruled that Congress did not have the authority to prohibit slavery in the territories.
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<span>Prior to the conclusion of the Seven Years War there was little, if any, reason to believe that one day the American colonies would undertake a revolution in an effort to create an independent nation-state. As apart of the empire the colonies were protected from foreign invasion by the British military. In return, the colonists paid relatively few taxes and could engage in domestic economic activity without much interference from the British government. For the most part the colonists were only asked to adhere to regulations concerning foreign trade. In a series of acts passed by Parliament during the seventeenth century the Navigation Acts required that all trade within the empire be conducted on ships which were constructed, owned and largely manned by British citizens. Certain enumerated goods whether exported or imported by the colonies had to be shipped through England regardless of the final port of destination.</span>
The Progressive Era is considered from 1890 to 1920. The major role of the United States in global affairs during this period of time was its involvement in the war.
The military affairs of that time included the war with Spain, the war to conquer the Philippines and the entry into the First World War.
Until the beginning of the 20th. century, political affairs in the US used to follow Washington and Madison, guidelines of neutrality and nonintervention.
But in those times, European nations turned into imperialism, establishing colonies in different parts of the planet. Time passed by when Theodore Roosevelt, influenced by <em>The Influence of Sea Power Upon History</em>(written by Admiral Alfred Thayer in 1890), understood the potential of investing money in other countries, securing the interest of the U.S.
In the 1910-1920's, the United States government followed an intervention policy in the Caribbean and Central America, the Philippines and even President Wilson supported the Mexican revolution.
Not able to trade is the situation we are currently facing
