What have you read and who did you ask? The general rule [0][1] is that you cannot keep your existing citizenship, with certain exceptions to that rule specified by law [2]. I don&#x27;t see any that apply to the US, though, most of them deal with situations where you <i>want to</i>, but for various reasons <i>can&#x27;t</i>, give up your previous citizenship. It&#x27;s possible that there&#x27;s a separate treaty with the US (as permitted in § 12 (3)), but I couldn&#x27;t find any.<p>IANAL.<p>[0] <a href="http:&#x2F;&#x2F;www.gesetze-im-internet.de&#x2F;rustag&#x2F;__10.html" rel="nofollow">http:&#x2F;&#x2F;www.gesetze-im-internet.de&#x2F;rustag&#x2F;__10.html</a>
[1] <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;German_nationality_law#Naturalisation_as_a_German_citizen" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;German_nationality_law#Natural...</a>
[2] <a href="http:&#x2F;&#x2F;www.gesetze-im-internet.de&#x2F;rustag&#x2F;__12.html" rel="nofollow">http:&#x2F;&#x2F;www.gesetze-im-internet.de&#x2F;rustag&#x2F;__12.html</a>