The England-to-Congress story
England has produced 10 naturalized citizens who went on to serve in the US Congress — 0 in the House of Representatives and 10 in the Senate. None are currently serving; all 10 have since left office. The first of them entered Congress in 1807, during the early Republic; the most recent arrived in 1921, during the Progressive Era through the New Deal. Collectively they represented 10 different US states — a reminder that naturalized-citizen members of Congress come from every region of the country, not a single immigrant gateway.
England is unusually open by global standards: certain categories of non-native-born residents can vote in national elections, and in some cases stand for office in its own parliament or legislative body. Specifically: As part of the UK, qualifying Commonwealth and Irish citizens resident in England can vote in all elections, including general elections. One of the most permissive regimes globally.
England-born members have caucused with multiple parties over the years — Democratic-Republican, Democrat, Republican — so there is no single partisan signature to the England-to-Congress pipeline. This is one of the rarer cases where the birth country broadly matches the American standard: England extends substantive political rights to long-term residents who did not start life as its citizens. Across the full history of the US Congress, England ranks 4th of 38 tracked birth countries, accounting for 10 naturalized-citizen lawmakers.
Put plainly: a person born in England can be entrusted by American voters with a seat in the US Congress, writing federal law for hundreds of millions of people. And, unusually, the reverse path is meaningfully open: an American who took up long-term residence in England could expect to participate in its democracy too. England is one of the few countries on this map where the answer runs both ways.