Can You Identify These "Historic Firsts" In The National Park System?

The country's first National Historic Site celebrated its 75th anniversary earlier this month, and the occasion offers the opportunity for some fun challenges for NPS trivia buffs. Can you identify the NPS area claiming this historic "first"? How about the location of America's first National Battlefield, or the former national park that's now a national monument?

The Only International Historic Site in the National Park System Celebrates 406 Years of History

Ranger-guided program at St. Croix Island.
The only International Historic Site in the National Park System is celebrating the anniversary of a key event that occurred 406 years ago. Do you know where it's located, and the country of origin of the early settlers of this island?