Yes, Shengen Area is only for people already in EU, so in theory, citizens of individual member states, like it is in US when going across state lines.
Individual member states still maintain right to close their own borders, as show by many that already did it.
People outside of Shengen still have to go through passport and visa process (assuming they are coming in legally, of course).
However, distances between civilization in Europe are much smaller than they are in US, we do not have several hour car ride worth of desert between cities...
Yes, Shengen Area is only for people already in EU, so in theory, citizens of individual member states, like it is in US when going across state lines.
Individual member states still maintain right to close their own borders, as show by many that already did it.
People outside of Shengen still have to go through passport and visa process (assuming they are coming in legally, of course).
However, distances between civilization in Europe are much smaller than they are in US, we do not have several hour car ride worth of desert between cities...