History of impeachment error
Your history of presidential impeachments missed one. The first impeachment proceedings were brought against John Tyler (President No. 10). The proceedings fizzled out before there was a trial, so he was only almost impeached. Andrew Johnson (No. 17) was impeached, Richard Nixon (No. 37) was almost impeached, and Bill Clinton (No. 42) was impeached. No president has been removed by impeachment, and it seems very unlikely that Trump will be either.