Why did the zimmerman telegram upset the united states? check all of the reasons that apply. it included comments about the cowardice of the united states. it threatened that germany would invade mexico. it declared the renewal of unlimited submarine warfare. it proposed an alliance between germany and mexico against the united states.

Select the correct answer from each drop-down menu. different sources are aimed at different audiences. sometimes a source can be directed at more than a single group of usually aimed at the general population across the globe. some sources may have a very specific audience. be specifically aimed at students or scholars with a background in literature.