Think about it from the point of view of an advertiser. What might make someone want to visit a national park?

because they are cool

To advertise their product.

Explanation:

They might go to a national park because they want to show that their product is eco friendly or something.

20 years ago

explanation:

the group i'm selecting: greeks.

a first group of greek immigrants came to the us in the 1850s. the second group came to america starting in the 1890s due to economic opportunities they didn't have back in their home caused by the hardships of ottoman rule. greek immigration was 90% male, many of them expected to work and return to greece after earning enough capital, but ultimately had to remain in the us after the greek genocide.