In the spring of 1871, the Roman rebellion led by Garibaldi and Mazzini ultimately ended in failure, and the Rebel Army leaders were forced into exile overseas.
Against the backdrop of the imminent British-French-Austrian tripartite alliance, in order to maintain relations with France, the London Government did not grant them political asylum this time.
However, true to its troublemaking nature, John Bull stepped in and sent them to the United States of America. This was a favorite haven for the Revolutionary Party in Europe, who liked to seek political refuge in the U.S., for two main reasons.
On the one hand, being thousands of miles away and less influenced by international politics, the Federal government was keen to shelter political dissidents, ensuring everyone's safety.
On the other hand, in economic terms, the United States of America was undergoing solid economic development and, as a European immigrant nation, one could get funding from fellow countrymen.