However, there was an armed conflict known as the Toledo War with the state of Ohio over the location of their mutual border. Meanwhile, the people of Michigan approved a constitution in May 1835 and elected state officials in late autumn 1835. Although the state government was not yet recognized by the United States Congress, the territorial government effectively ceased to exist. President Andrew Jackson's government offered the remainder of the Upper Peninsula to Michigan, if it would cede the Toledo Strip to Ohio. A constitutional convention of the state legislature refused, but a second convention, hastily convened by Governor Stevens Thomson Mason, consisting primarily of his supporters, agreed in December 1836 to the deal. In January 1837, the U.S. Congress admitted Michigan as a state of the Union.