The battle that took place after the Treaty of Ghent was signed was the Battle of New Orleans.
The United States declared war on Britain in 1812. It did so because Britain refused to stop seizing American ships that traded with France—Britain's enemy in Europe. Sometimes there were also seizures of American sailors. These seizures were known as impressment
In General Wheelers own words, "this terrible catastrophe [sinking of the Maine] though not the cause of the outbreak of hostilities, certainly hastened the action of Congress in its declaration of war against Spain." According to Wheeler the Spains actions in Cuba were already leading to war between Spain and the US. The sinking of the Maine was the final straw that decided the congress to vote for war. But war would have come without the sinking of the Maine.
Third parties have had a major influence on U.S. policy and political debate despite their minor presence in Congress — currently only one U.S. senator and one member of the House of Representatives is an independent.
In the late 1800s and early 1900s, the Socialists popularized the women’s suffrage movement. They advocated for child labor laws in 1904 and, along with the Populist Party, introduced the notion of a 40-hour work week, which led to the Fair Labor Standards Act of 1938.