Yes believe it or not in Mexico the federal government issues passports, and in the countries where Mexico has foreign relations it is accepted as and ID. In the countries that require a visa to go in the country legally, you need a passport. If we full fill the requirements of the American State department, we can travel inside the USA, with a Mexican Passport.
Yes, but it depends on the countries he/she wants to visit. For example, Canada and the US require visa; a Mexican can enter most European countries with his/her passport only.
Yes, that is the purpose of a passport. They are allowed to stay 90 days for travelling but any longer they are supposed to get a visa.
The easy part is to enter; but on your trip back to the US you may be intercepted and be subject to interrogation by US Homeland Security officers.
No. He/she will also require a visa, issued by the US Government.
Yes, as you would qualify as a Mexican citizen. However, problems would arise if you try to go back to the States, as you would be subject to all Immigration requirements for non-US citizens.
Yes, but you may not cross any borders and you risk being arrested and deported if you do not have a valid visa when Customs or ICE inspects your passport.
Yes
yes
I may be wrong, but all you need is an I-94 form and your Mexican passport as ID
You'll need a US PASSPORT to return to the US.
None needed for travel within US
Indeed.
No passport is needed to travel within the United States. This is a nation of states that are the same country.
Yes, but you will need some government issued photo id (Driver's license, etc).
A Mexican passport would be an acceptable ID to use, to fly from the mainland U.S. to the state of Hawaii.
Only in the US and it's territories.
yes they hv required the entry permission at Mexican immigration.
None needed to travel within the US.
yes,as long as you have no criminal record.
When traveling from Puerto Rico to Florida, no passport is needed. Puerto Rico is part of the US, as is Florida. Traveling from Puerto Rico to Florida is travel within the United States. Citizens do not need a passport to travel within the US, although they do need some form of government-issued photo identification to get on a commercial airplane and a passport will serve that function. Non-citizens who are in Puerto Rico have already entered the US using a passport (or similar document for Canadians) and so need only the identification they would need to travel within the US, for example, from Miami to Atlanta, to travel to Florida or other locations in the US.