Answer:
"We not only preserve important historic sites within national park boundaries, but also work beyond those boundaries to ensure that everyone's history is saved."
Preserve here means: to take care of, to make sure nothing happens to it, to keep something safe
"Whether you want to visit an iconic historical park, discover American stories, or journey through a natural preserve, we hope you discover something new about history during your visit."
Preserve here means: a special place in nature, place where nature is protected, including all plants and animals
Step-by-step explanation:
Preserve has multiple different meanings.