How do you say 'Do you speak American' in German?

Answer 1

Please do not say "speak American". There's no such thing. We speak English, not American.

In German, say:

Sprechen Sie Englisch? (formal)

Sprichst du English? (informal, singular)

Sprecht ihr Englisch? (informal, plural)

Answer 2

A male would say"Ich bin Amerikaner".

A female would say"Ich bin Amerikanerin".