Question

Popular sovereignty expressed what belief?

that all former slaves presently living in a free state were officially freedmen
that a territory itself should decide if it wants to allow slavery within its borders
that even if a slave escaped to a free state, he could never be a freedman
that Congress should decide whether a state is a free state or a slave state

Answer 1

that a territory itself should decide if it wants to allow slavery within its borders

Answer 2

That a territory itself should decide if it wants to allow slavery within its borders

Step-by-step explanation:

The Popular Sovereignty doctrine holds that all political power is inherent in the people, that is to say, people create and determine the nature of its government, gives consents to it and sustains it; people tend to accomplish this by electing their representative through fair elections, which should advocate for their interests.

Thus, this principle expresses that is the people itself who should decide if it wants to allow slavery, or any type of system, within its border.