26th President: Theodore Roosevelt, 1901

Nacho = 26 (Roosevelt was the 26th president)

Rose belt = Roosevelt

Post = 901 = 1901 became president

The door = Theodore 

He ate nachos (26) while he waited for his new rose belt (Roosevelt) to come through the post (901).

Connect Roosevelt to Theodore

He didn't realise it, but his rose belt (Roosevelt) had already been posted through the door (Theodore).

NOTE: The way Mammoth Memory remembers Theodore is to think of "the door".