Under the homestead act, an applicant who was not a us citizen could receive a parcel of land if he or she pledged to pay the required filing fee. agreed to farm the land within five years. had filed for us citizenship. had been a resident for twenty-one years.

Had filed for US citizenship is the correct answer.

 Horizontal integration enabled Rockefeller to gain tremendous control over the oil industry and use that power to influence vendors and competitors. For example, he could pressure railroads into giving him lower rates because of the volume of his products. He undercut competitors, forcing them to set their prices so low that they could barely stay in business—at which point he could buy them out. Through horizontal integration, he was able to create a virtual monopoly and set the terms for business. While his business model of a holding company was technically legal at that time, it held as much power as a monopoly and did not allow for other businesses to grow and compete.