Because those States supporting Adams and those supporting Henry Clay (who had now allied with Adams) formed a majority of Congressional State delegations. Had Clay allied with Andrew Jackson, their combined support would have been one state short of a majority, so that unless an additional state changed its vote, Inauguration Day 1825 would have arrived with no President chosen, and Vice President-elect John C Calhoun would have become President.
the house of representatives elected him
President Andrew Jackson was president after John Quincy Adams
yes Andrew Jackson did john quincy adams
Following Adams was Andrew Jackson.
John Quincy Adams
John Quincy Adams was the first president to be denied reelection. He lost the election to Andrew Jackson. He then was elected to the House of Representatives.
John Quincy Adams
Andrew Jackson
1824
Quincy Adams
John Quincy Adams
John Quincy Adams was the president before Andrew Jackson