When did the united states officially enter the fighting in world war 2? why?

Which of the following areas has the highest population density?

I’m his published 95 theses,martin luther protested against? a-the selling of indulgences within the catholic church b-the belief in predestination c-the worshipping of statues of saints d- the catholic church focus on faith as the sole means of salvation

Physical features of central america look at the map above which of the following is true