I've often wondered how the USA and Canada secure their border areas out west, where there is a vast area of empty land and no rivers or other such natural barriers to prevent people simply crossing the border on foot or on horseback, for example. They don't have a fence or a wall, so how can they watch that whole border? Do people just walk across? I'm assuming they do.

In Alberta and B.C. you have a lot of forested and mountainous areas bordering on the USA. It should be a cinch for hikers to cross the borders undetected. Then in the prairies there is a tremendously long border with a few roads and a few towns and lots of empty land.

Then you have another extensive area of forested land meeting at Quebec/New York State and on east from there.

If someone wanted to just walk across in any of these areas, what would be their chances of making it unnoticed?

*Why am I asking? Well...we're cookin' up this little invasion plan here, see? We start by infiltrating hundreds of thousands of Canadian beavers, via the waterways. And that's just the beginning.