Each year between April and October millions of baseball fans head out to fields across

America to watch their favorite teams compete against each other. But how and when did baseball become recognized as the national sport of the United States.

To engage the reader, the author

The author end the paragraph with a question to make the reader wonder how baseball became the national sport of the United States.

To engage the reader, the author ends the paragraph with the question "But how and when did baseball become recognized as the national sport of the United States?"

Explanation:

By using a question at the end of the paragraph, the author makes the reader wonder how baseball became recognized as the national sport of the United States. This is a technique used to capture the reader's attention because it is engaging and it provokes the reader's curiosity.