Which factor contributed most to the beginning of world war 1?

there are more than one but if the question is multiple choice you can choose from nationalism, imperialism,militarism, alliances, and assassinations if its a short answer than just say any one of those because they all had a big role on starting WW1

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )    

the correct answer is d

a conference committee is a group of congress representatives appointed by the senate and the house to reach an agreement over a bill that had different versions in each chamber. this is due to the fact that, to pass a law. both the house and the senate must agree on the exact same content and wording of the bill to present it to the president.