Which of the following best describes Frederick Jackson Turner's frontier thesis? (1 point) Responses The frontier is a sacred land that should be developed in a sustainable way. The frontier is a sacred land that should be developed in a sustainable way. The frontier is an endless, open land that is ready to be developed for profit. The frontier is an endless, open land that is ready to be developed for profit. The frontier caused Americans to settle too far apart to develop a sense of unity as a nation. The frontier caused Americans to settle too far apart to develop a sense of unity as a nation. The frontier developed American democracy by blending wilderness and European tradition.