Sorry Mongoose, but Biden wouldn’t even crack the top-5 of that list. The top spot goes to Andrew Jackson who signed the Indian Removal Act leading to an event labeled the Trail of Tears.
en.wikipedia.org
Close on his heels is Teddy Roosevelt for something so dark that it is left out of most lower level history books. In the Philippine-American War, we built concentration camps that contained all males on certain islands over the age of 9 years old. The death toll among Pilipinos was somewhere between 200,000 and 1 million.
en.wikipedia.org
With history, the victors get to write the story, but there was no way to spin that one so it is omitted even though it explains other events.
We won the Spanish-American war which gave us the Philippians, who we had promised independence if they helped us beat Spain. We went back on our word because we wanted to use the islands as a forward base of operations which caused the locals to go to war with us for their independence, and they lost. We set up a strong American naval presence there which we used to hinder Imperial Japan from getting the iron, oil, and rubber they needed from Java causing Imperial Japan to attack our Philippine bases while also attacking Pearl Harbor, the base most likely to support any effort to retake the Philippines. That drew us into WWII.
History flows from the Spanish-American War to WWII, but because the American-built concentration camps are left out of history books, most American kids never learn it. They think there was a Spanish-American war in olden times, and later Japan bombed Pearl Harbor because they were allied with evil Nazis who ran concentration camps.