All my life GOP has been the war loving hawk party.
When LBJ passed civil rights in the sixties, the devolved to use the Southern Strategy. Anti civil rights. Pro prejudice politics.
Nixon continued the policy of war and dirty tricks. Eisenhower oversaw the coup of Mosaddeq (the elected leader of Iraq). Nixon blocked ending the Vietnam war to get elected. Then he went continued his evil and deceitful tactics.
Ford pardoned Nixon, setting a precedent that the president would not be accountable to the law.
Reagan probably attempted to delay the release of American Hostages in order to get elected. He ignored AIDS for nearly two years because he thought it was a "gay disease". He committed crimes via the Iran Contra affair. He was warlike, pro-military, and prejudiced. And like Nixon, his crimes went unprosecuted.
Bush Sr. was relatively OK, but was pro-military and used dishonesty against political rivals.
Bush Jr. began the tradition of stupidity in the GOP. Sarah Palin, etc. He ignored intelligence indicating a terrorist attack was imminent around 9/11. He started a war with Iraq to deflect from his inability to find Bin Laden. He also used dishonest campaign tactics to get elected.
On consideration, Reagan was also a founder of GOP stupidity.
Enter Clusterfuck Trump.
The GOP has "learned" that lies and hatred are effective campaign tools. Just like the Nazi's, they know that selling hatred does not require honesty or intelligence. It just requires repeating lies continually (Ben Ghazi) and blaming anyone convenient for the problems they create.
The GOP has devolved into a party of criminals.