Which item in the list are secondary sources a historian could use to contextualize why a political revolution occurred in egypt in 2011?

the monroe doctrine is the best known u.s. policy toward the western hemisphere. buried in a routine annual message delivered to congress by president james monroe in december 1823, the doctrine warns european nations that the united states would not tolerate further colonization or puppet monarchs.

the titanic was filmed in canada and si my fav