What event contributed to America's entry into world war 1?

What is the political concept advocating change in small steps? Leading up to the Civil War the southern states could accurately be described as? Is Missouri part of the confederacy? Who were the first known inhabitants of Missouri? Where did end of civil war take place? What was most important to the social political and economic lives of African Americans after the Civil War? Does the us have slaves? What changed after the Treaty of Utrecht for the French the British and First Nations? Who led slaves revolts in Virginia which led to harsh fugitive slaveslaws? What meant that the dollar was convertible into gold only? What is the value of an 1836 buffalo Indian head nickel? Who was the mayor of west Berlin during the Berlin airlift? What is the value of an 1925 us one dollar coin? Who was the first black man to win the medal of honor? Who founded samata sangh? What were some major cities in the union states? What was cotton used for during the Civil War? Has the relationship between the Crips and the Bloods changed over time? What statement is true of the French colonists in the America? Who introduced the permanent settlement act in Bengal?