The United States entered WWII after the Japanese bombed Pearl Harbor.
Black kettle is the answer hope this helped
<span>Assuming that this is referring to the same list of options that was posted before with this question, the best answer from the list would be a "system in which land was granted to citizens for free in order to persuade them to move to land that needed farmers" since this was a vital way for the US government to assure that land didn't go unworked. </span>