How did the islamic empire gain wealth?

If the rights to intellectual property are not sold or given away who owns the intellectual property

Which of the following are details about the compromise of 1877? election results in a couple of states were in dispute and too close to call. samuel tilden would be given the win in exchange for the removal of federal troops. the presidential election was close between rutherford hayes and ulysses grant. it was agreed troops would leave the south in exchange for a hayes victory.

Which best describes the impact of the crusades on european exploration?