Does united States have border lines in Canada?
The US has border lines WITH (not IN ) Canada.
Yes, there are several transcontinental rail lines in North America. One is in Canada, just north of the US border. Several are in the United States with a major line running through the northern states, another across the middle of the country, and another from southern California through Texas and along the Gulf Coast.
Can you travel the whole length from border to border of the US on the Mississippi river why or why not?
Not quite. The Mississippi river flows through many US states, and some of its tributaries extend into the Canadian border, specifically at the Lake Ontario (New York) or into the Canada-Montana border, as well as into the Gulf of Mexico. If you define the Gulf of Mexico as a border, it would be considered as a border-to-border river, however most borders are defined as the division lines between countries, not between a country an an…