Which method of transit has had the biggest impact on world trade in the twenty-first century?
railroads
canals
steam boats
container ships
30 pts need asap

Container Ships had the biggest impact. There are ports everywhere around the world. Container ships can carry around 18000 20 foot containers from port to port. Plus, all of the other options had big impacts on trade in the 19th and 20th centuries while container ships are more modern.