Answer:
You didn't include an image but I think the answer you're looking for is Mexico since Texas was a part of Mexico before the Mexican-American war.
Answer:Many Americans supported the war effort by purchasing war bonds. Women replaced men in sports leagues, orchestras and community institutions. Americans grew 60% of the produce they consumed in “Victory Gardens”. The war effort on the United States Home Front was a total effort.
Your answer is definitely the third one about Spain. The Spanish had nothing to do in the Pacific besides the Philippines.
The correct answer is A. The outcome of polks expansionist policies in the Oregon Territory was that it was split between the United States and Great Britain.