Final answer:
Theodore Roosevelt enacted several significant reforms as governor, including trust-busting, conservation of natural resources, and regulation of railroads, but the expansion of the military was not one of them during his term as governor.
Step-by-step explanation:
As governor, Theodore Roosevelt enacted several reforms, but expansion of the military was not one of them during his governorship. His achievements as governor included trust-busting, where he initiated lawsuits against corporations like Standard Oil and American Tobacco Company, thus labeling him as a "trust buster". Roosevelt's commitment to conservation of natural resources was profound; he set aside millions of acres for forest reserves and established numerous national parks, inspired by conservationists like John Muir. Another significant action was the regulation of railroads, as exemplified by his administration's pursuit of the Northern Securities Company to disband the railroad trust for its monopolistic practices.