…………help me please I’m on a time

Which of the following was probably the most difficult challenge facing construction of the railroad?

What are your thoughts about " the attacking on the twin towers". in your own words a little paragraph its for a project i am doing and i want to get intel from other people so that i can put it on my poster. for anyone who gives me there opinion on it : ) enter you name when you type the paragraph more than one person to respond.

One outcome of the social gospel movement was 1) a new kind of music. 2) settlement houses. 3) increased immigration. 4) taxation on the wealthy.