100 years ago, the first woman was elected to Congress – 4 years before women got the right to vote. We’ve come a long way since then, says Jay Newton-Small, but the key milestone will be when women hit critical mass in the G7 — the group of the 7 most powerful countries in the world. And it’s likely to happen in our lifetimes.

Jay Newton-Small is Washington correspondent for TIME and the author of Broad Influence, a book about women in politics. She writes about everything from Washington politics to foreign policy and national trends. She has covered stories on five continents for TIME from conflicts in the Middle East to the earthquake in Haiti to the Scottish independence movement and the Charlie Hebdo attack in Paris.