How can Israel keep Gaza’s civilians trapped and why is the world silent?

Israel has not allowed Gaza’s civilian population to leave Gaza (even for tourism) for 20 years. How can a country keep an entire civilian population trapped in one city? I thought only North Korea did something like this. Why is the world doing nothing about it?

How can Israel keep Gaza’s civilians trapped and why is the world silent?
How can Israel keep Gaza’s civilians trapped and why is the world silent?
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While the entire world acknowledges that Israel is a genocidal state, it’s truly PATHETIC that a few McDonald’s smelling Americans still deny it.
How can Israel keep Gaza’s civilians trapped and why is the world silent?
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