What event is celebrated during Nebraska’s Arbor Day?

The event celebrated during Nebraska’s Arbor Day is tree planting. Arbor Day is dedicated to promoting the planting and care of trees, emphasizing the importance of trees for the environment and community. In Nebraska, this celebration is particularly significant as the state was one of the first to establish Arbor Day, which was founded by J. Sterling Morton in 1872. The day encourages individuals, families, and communities to plant trees and recognize their value in providing shade, improving air quality, and enhancing overall beauty.

The other options, while related to important aspects of Nebraska's culture and history, do not capture the specific focus of Arbor Day. Crops harvest pertains to agriculture and the cultivation of crops, which, while vital, is not the theme of Arbor Day. Native American history is an important aspect of the state's heritage but is not the primary celebration of this day. Similarly, statehood commemorates Nebraska's admission into the Union and is separate from the activities associated with Arbor Day. Thus, the emphasis on tree planting makes it the correct choice for this question.