Why is gulliver so eager to assert his own country's importance to the brobdinnagians?

Gulliver asserts his own country's importance to the Brobdingnagians in hopes of gaining their favor and protection. He wants to convince them that England is a formidable nation, hoping they will treat him well and not harm him. Additionally, by emphasizing his country's strengths, Gulliver may also be attempting to feel a sense of pride and security in a foreign and potentially threatening environment.