Why might the Soviet Union spy on Canada or plant spies in Canada? {PLEASE HELP}

In relation to the september 11th attacks, the term ground zero refers to new york city. the pentagon. the shanksville, pennsylvania, memorial. the site of the world trade center.r

Which of these was an accomplishment of the han dynasty? the invention of the seismograph finding a water passage to europe the invention of the ballpoint pen the invention of the abacus

Which describes a significant different between the north and the south in the year leading up to the civil war