The article shared below gives a brief overview look at the history between these two countries. It covers from the Pennsylvania Dutch (why called “Dutch”? learn why in the article) to Modern day relations.

Some subtopics include:

• First German expats arrive in America
• German culture begins to spread
• American Civil War and the German Revolutions
• The First World War
• World War II
• East and West Germany
• Reunification of Germany

Article Link
The History Between USA and Germany
(by iamexpat.de)