He sent the U.S. Navy and Marines to fight the pirates and protect American ships and trading, which resulted in the Barbary War. In 1801 pirates captured American sheeps, demanding America pay tribute to the Barbary rulers, and Jefferson refused to give any cent which lead to War.
The answer would the Columbian Exchange.
"<span>A. It amounted to an informal declaration of Cold War" would be the best option, but it was not even remotely formal--in that it simply said that the US would come to the aid of any countries in danger of becoming communist. </span>
The Constitution provides that an amendment may be proposed either by the Congress with a two-thirds majority vote in both the House of Representatives and the Senate or by a constitutional convention called for by two-thirds of the State legislatures.
