We've tightened the security around major US politicians, and especially the President, a ton over the 20th century, especially. It's even increased a bunch sin

We've tightened the security around major US politicians, and especially the President, a ton over the 20th century, especially. It's even increased a bunch since e.g. the 1950s. Anyone could just walk onto the White House grounds without challenge for a really long time, for example.