Why did Tecumseh form an alliance with the British after the Battle of Tippecanoe?

In 1811, when Tecumseh was in the South, a group of natives led by Tenskwatawa, attacked U.S. army forces in the Battle of Tippecanoe. ... Following the Tippecanoe defeat, Tecumseh realized even more how important it was for a British alliance.

Explanation:

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the graph shows the spread of railways in the 1800s.

based on the graph, the conclusion that can be drawn about germany is answer d)   by 1880, germany had more rail lines than great britain and russia.