Answer:
I could be wrong im not entirely sure but I think the answer would be automobile
The answer is D
Reason being that the sinking of ships by German U-boats, and a German attempt in the Zimmermann Note to get Mexico to declare war on the U.S. pushed the U.S. to getting involved.
The mountains, Riverdale weather could of slowed down the spread of Christianity
The fourth amendment is what protects Americans from unreasonable search and seizure and is the root of the term "probable cause."
Frankly, I could say a lot more but you'd certainly get more thorough information by just going to wikipedia.
