What caused the ultimate downfall of the byzantine empire?

How is thomas jefferson related to the war of 18122 a. during his term, he made defense cuts that left americans at a military disadvantage b. as madison’s vice president, he served as a commander in chie c. he convinced congress to declare war though his propaganda efforts d. he authored the treaty ghent which ends the war

The enforcement clause of the fourteenth amendment states what congress had the authority to a. grant citizenship to people b. change the constitution c. enforce only the bill of rights d. make laws to apply the amendment

The mongols were descendants of a. pastoral nomadic tribes b. tibetan tribes c. shang nobility