Why might historians say that the Louisiana Purchase was possible only because of good luck?

During world war if an artist published an editorial cartoon criticizing the american entry into the war that artists was guilty of

How did modern american history begin with “contact”?

Consider the events in alfred wegener's life that led to his development of the continental drift hypothesis. review the items below and determine whether each item is (1) an observation that led alfred wegener to develop his continental drift hypothesis, or (2) evidence wegener gathered to support his proposal.