The Welcome to Illinois Historical Marker in Quincy, Illinois pays homage to the crucial exploration of the Mississippi and Illinois Rivers by French explorers Louis Jolliet and Father Jacques Marquette in 1673. Their expedition played a significant role in establishing French claims on the region until it was eventually ceded to Great Britain under the Treaty of Paris in 1763. This marker serves as a testament to their journey, which has left an indelible mark on Illinoiss history and heritage. As you stand before this historical marker, let your imagination take you back in time to the days when these brave explorers navigated the mighty rivers that shaped the landscape of this great state.