U.S. policy on dual nationality can be found
Since 2007, the borders to Gaza have been effectively closed by a blockade enforced by Israel and Egypt, with entry/exit only for journalists and people connected to approved international or humanitarian agencies. Entry by sea is completely prohibited, with Israeli naval vessels using military force against any attempts. The northern land crossing, linked to Israel, requires a travel permit - that is rarely granted. Getting in via the southern land crossing, linked to Egypt, is easier but the crossing is often closed, opening only for a few days per month.