The efficient new system allowed Seattle to expand after 1945 with the Sea - Tac airport .
The efficient new system enabled Seattle to become one of the first Pacific Coast ports to move to containerized shipping and thus expand business with Asia .
The efficient new system allowed Seattle to expand after 1945 with the Sea - Tac airport , and enabled Seattle to become one of the first Pacific Coast ports to move to containerized shipping and thus expand business with Asia .