It was not "the U.S." who determined a peace deal has to be delayed. It was Israelis who are working in the U.S. government. They don't want a peace deal so they will delay again and again. It is not a secret what is going on. Are there people who don't know?
Poland's central bank head calls story of Nazi train find a hoax (Reuters)
from the article: U.S.: One year may not be enough to achieve Mideast peace