Partly because of the lumber industry's need for transportation, and partly due to the prevalence of wood and carpenters along a very long coastline, shipbuilding became an important industry in Maine's coastal towns. The Maine merchant marine was huge in proportion to the state's population, and ships and crews from communities such as Bath, Brewer, and Belfast could be found all over the world. The building of very large wooden sailing ships continued in some places into the early 20th century.