Before Ronald Reagan gave the Vatican an embassy, the Vatican was allowed only a delegation/delegate and even this delegation was not allowed until after the Civil War. Why? Eight Catholics had conspired to kill Lincoln.
Within months of President Reagan’s inaugural in 1981, President Reagan moved quickly and on January 10, 1984, announced that full diplomatic relations between the United States and the Vatican had been established. The President did this over the opposition of the office of the Secretary of State. One of those speaking strongly in favor of the Holy See role at the UN was the Hon. George W. Bush, then the Governor of Texas.
For 117 years, the Vatican was banned from Congress from having an embassy in the US until Roman Catholic for the Jesuit assassination of Abraham Lincoln. In 1984, Ronald Reagan, with the help of the conspiratorial Congress, reinstituted full diplomatic relations with the Vatican.