The untied States and Canada share the longest undefended border in the world. Stretching 5,522 miles (8,887 kilometers), this " friendly frontier" is sometimes lake, sometimes river, and sometimes open field. There are 96 official border stations. This leaves miles and miles without border stations.
The United States was unique in the world as a democracy of people from many different nations.
You mean on the US or Mexican side?
The Monroe doctrine
South America's Amazon River is the world'slargest because it carries more water to the sea than any other river.The is only one 'biggest' river. However you need to define what you mean by biggest. It could mean the longest or, as stated above, the one with the largest volume of water.
This is an impossible question to answer as mesoamericans still live. These are the native people who live in the region of Central America from central Mexico to the southern border of Costa Rica. If you mean to refer to the group or tribe of mesoamericans and those who remained active the longest, it is still impossible to answer as people have lived in the region from about 11,000 BCE or before, and these broke up into the various tribes, which incorporated each other, merging and combining and remerging. Those with native ancestry from the mesoamerican region will be able to trace back to Aztecs, Incas, Olmec and others.
it means there is no more wars between Canada and USA so they don't need to defend it anymore
The longest word in the world is "pneumonoultramicroscopicsilicovolcanoconiosis," which is a lung disease caused by inhaling very fine silicate or quartz dust. It is more commonly known as pneumoconiosis.
If you mean longest, that is is the 31st longest river in the world
It means the longest word in the world
If you mean world's then it's the Nile
If by through, you mean just by touching it's border it counts, it could be the Mississippi
长江is a river in China, the longest river in Asia and third longest in the world.
it depends on what you mean by unprotected since there are in fact many sorts & levels of border protection but i would say most plausibly Portugal & Spain at 1214 km
The Amazon River, and is either the longest or the second longest in the world.
Hmmm, what do you mean by " which world?" :P Haha please be a little more clear in your question
Do you mean the longest? Canada has the longest coastline.
The word 'hippopotomonstrosusquipidaliophobia' means a fear of long words, ironically it's the longest word in the world!