World war 2 was caused, in part, by which of these factors?

russia and the united states we're at a verbal war that was nuclear russia wanted more power and to take over more countries

your list doesn't mention any of them at all.

and what does "these" mean anyway ?

In the proclamation of 1763, the king declared that no American settlers may move past a line drawn across the Appalachian Mountains. All the land west of this land was to be reserved for Native Americans. This was caused by a revolt called the Pontiac Rebellion, which was led by a Native American tribe leader.