What was the name of the Germanic tribe that was the most successful?

Chatti

Explanation: Chatti, Germanic tribe that became one of the most powerful opponents of the Romans during the 1st century ad. At that time the Chatti expanded from their homeland near the upper Visurgis  River, across the Taunus highlands to the Moenus  River valley, defeating the Cherusci and other neighbouring tribes.

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they are best known for the cliff pueblos found throughout arizona, new mexico, colorado and utah. and for their development of desert farming.

hope i

-lavira: )