Why did the presidential election of 1876 anger Democrats?

Tilden, won the popular vote with a majority, but there were conflicting electors from four states which meant no one had a majority in the electoral college. ... Whereas, the Democrats argued they should be decided by Congress, which had a Democrat majority.

Samuel J. Tilden, won the popular vote with a majority

Explanation:

In the 1876 election the Republicans carried the election with 1 electoral vote, however, Republican Hayes lost the popular vote to Democratic Tilden. So obviously with conflict, people still felt opposition to Hayes's narrow victory and many Democrats raised queries, affecting Reconstruction.

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