It would be "(D) the bombing of the Oklahoma City Federal Building," that is not associated with Al Qaeda, since this was an act of "domestic terrorism," that was carried out by a Christian white male.
The Democratic Party lost popularity and the 1952 election because of U.S. involvement in Korea. The heavy cost of the war in terms of money and American lives and the failure to win the war were partial reasons for the loss.
There were several ways in which the US government increased Mexican immigration, but the best option is "congress passed laws saying that all Latinos fleeing dictators are welcome"
