Anything that has happened historically has been going on for a long time. A historically accurate picture of a time portrays it just right. If your model of a 1950’s soda shop is historically accurate, your grandmother will love it.
Historically refers to things that have happened throughout history or somehow relate to history. If something is historically very difficult, then it’s been hard to do for a long time. Historically, nations have gone to war over oil. Wilt Chamberlain played historically well, scoring 100 points in a basketball game. As the first black President, Barack Obama is historically significant.