<span>To enforce and administer federal laws
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The creation of the League of Nations
Europeans didn't use maritime routes before the age of exploration because they thought that Muslims controlling Portugal and Spain made maritime routes unsafe together with the fact that they didn't have the required transportation and navigation skills to travel.
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Jefferson and Madison would create the Democratic-Republican political party to be a voice for the common man against the elite Federalist party. The two men fought laws and policies enacted by Washington and Adams when they believed they violated the Constitution and the rights established by the Bill of Rights.
One example of this was Jefferson's writing of the Kentucky and Virginia Resolutions in regard to the Whiskey Tax. Though written anonymously, he suggest the states (the people) were allowed to nullify, or ignore, federal laws that the people did not agree with. He suggest it was in the rights of the people to refuse to pay the whiskey tax.
Jefferson and Madison were both outspoken about their disagreement with the passage of the Alien and Sedition Acts by John Adams. Jefferson would overturn the acts after becoming the third president of the US. Madison also stood against John Adams in regard to the "midnight-appointments" which was an expansion of the federal court system. Madison refused to issue the confirmations of the judges causing one to take Madison to court in the famous case, Marbury v. Madison.
Answer: In the aftermath of the war, internationally the world was changing, Europe was slicing up Africa, many countries started fighting for their independence, and the fight for influence and money ensued between the most powerful nations. During the time periods of 1865-1900, the US sought to keep up with Europe and expand its sphere of influence in the world under the leadership of Roosevelt, McKinley and other presidents.