Besides seeking to improve local life, Boulton took an interest in world affairs. Initially sympathetic to the cause of the rebellious American colonists, Boulton changed his view once he realised that an independent America might be damaging towards British trade, and in 1775 organised a petition urging the government to adopt a firmer stance with the Americans—though when the revolution proved successful, he resumed trade with the former colonies. He was more sympathetic to the cause of the French Revolution, believing it justified, though he expressed his horror at the bloody excesses of the Revolutionary government. When war with France broke out, he paid for weapons for a company of volunteers, sworn to resist any French invasion.