Trump's new White House photo hearkens back to past portraits where presidents appeared unsmiling against dark backgrounds.

As the world has vastly changed, so has protection for presidents since the days when the public could come to the White House to meet Abraham Lincoln.

During his final two years in office, Jackson presided over the beginnings of the Second Seminole War. That war, also in Florida, started in 1835 and concluded in 1842.

As the world has vastly changed, so has protection for presidents since the days when the public could come to the White House to meet Abraham Lincoln.

Protective details have grown in size, responsibility and technology over more than a century of the Secret Service protecting presidents.

As the world has vastly changed, so has protection for presidents since the days when the public could come to the White House to meet Abraham Lincoln.