Their defeat in the Crimean war and the spread of nationalism. I think.
John Wilkes Booth.
John Wilkes Booth was an actor.
Abraham Lincoln died on April 14, 1865.
Answer:
The thick jungle and vegetation hinder american forces from using their material advantage of tanks and other sorts of ground combat vechiles. That's why the US used agent orange to try and clear vegetation and jungle so the vietcong couldn't use it as places to hide and retreat to when ambushing American troops
