How did the St Lawrence seaway have an effect on Colorado?

The St. Lawrence Seaway, completed in 1959, primarily facilitated maritime trade between the Great Lakes and the Atlantic Ocean, impacting U.S. economic activity broadly, including states like Colorado. While Colorado is landlocked and does not directly benefit from the seaway, the increased shipping capacity and trade routes helped boost the overall U.S. economy, leading to enhanced demand for goods and services. This economic growth indirectly supported Colorado's industries, including agriculture and manufacturing, by providing broader markets for their products. Additionally, improved transportation networks stemming from increased trade can enhance logistics and distribution for businesses in Colorado.