No specific laws listed as broken. Previous impeachments listed specific laws.
Divided along party lines. No previous impeachment was like that.
Incorrect, previous impeachments were for even such things as "drunkenness". For the President the standards is "high crimes and misdemeanors". If you try to interpret that literally you will get the wrong answer.
This is an excellent article to read:
The Common Misconception About ‘High Crimes and Misdemeanors’
"But this is not, in fact, what the Constitution requires. “High crimes and misdemeanors” is not, and has never been, limited to indictable criminality. Nonetheless, despite centuries of learning on the point, there the phrase sits, begging to be taken at its delusory face value.
Accordingly, in nearly every significant American impeachment since 1788, the defenders of the impeached official—whether president, judge, senator, or Cabinet officer—have argued that their man can’t properly be removed, because what he did wasn’t actually a statutory crime. This process has already begun for President Donald Trump. Among the first things the president’s personal lawyer Jay Sekulow
said in a September 27, 2019, CBS interview about the Ukraine affair was that the phone call between Trump and Ukrainian President Volodymyr Zelensky involved “no violation of law, rule, regulation, or statute.”"
Think of "high crimes" as crimes that the everyday person cannot perform. As a result there are no specific laws against them. So did Donald Trump perform "high crimes". Yes he did. If you want to go over them we can. That there are no specific laws against them does not really matter.