After austria-hungary annexed bosnia and hergezgovina, why was there tension between serbia and austria-hungary

Which portuguese explorer discovered brazil

What initiatives were taken by americans to benefit the war effort? 1. americans planted home gardens to ration food for the troops. 2.american charities were established to provide aid to factory workers. 3.american companies joined together to make products more cheaply. 4.americans created clubs for promoting weapons to be used in the war.

What happened 10 million years ago? if u answer, u get 50 ! plz answer ; -;