What doctrine did President James Polk used to justify sending US troops to the Rio Grande at the start of the Mexican-American War?

What are original pictures of Holocaust worth? Is the encomienda system good or bad for colonial society? Why is Old Dominion Virginia's state nickname? What did the black foot tribe have for shelter and what was it made of? What happened to the ship HMS Resolute? What did women who worked in munition factories during World War 2 do? What was Alexander Hamilton opinion about the president's terms of office? Why did the Japanese want to conquer the Dutch East Indies? What is Jack short for? Can military take over your house during crisis? Why were trenches narrow? Why did people call harriet tuman mosses? What did roosevelt do after pearl harbor attacks? What did medieval people use to make the wool so itcy out of? The most expensive baseball glove? What would history be like if Constantine the Great had never vision the night before the Battle of Milvian Bridge? How long was Rosa Parks arrested for? How did the introduction of factories change the way goods were made in the colony's? Why is the German you boat called the German you boat? What was used to kill people in the Vietnam war?