Based on container port statistics (https://en.wikipedia.org/wiki/List_of_busiest_container_ports https://en.wikipedia.org/wiki/List_of_busiest_container_port..

Based on container port statistics (https://en.wikipedia.org/wiki/List_of_busiest_container_ports https://en.wikipedia.org/wiki/List_of_busiest_container_port...) LA and Long Beach are not very big compared to Rotterdam and Antwerp. And Hamburg is roughly in the middle between LA and Long Beach in size. LA and Long Beach don't seem big enough to cause a global problem.