You need some form of national photo ID on you at all times to enter or leave a country. This is usually a passport. In some cases a national identy card or passport card is accepted.
Whether you need to carry this with you at all times depends on the laws of the country. Some countries do require it, some don't. If in doubt, it is better to carry your passport.
Please be sure to carry your ID in a secure way, since passports are often stolen from tourists.
no but to go out of the country you do yes you do now
Alien? If he or she is Alien then no. But if he/she human then yes need passport.
Yes, you do. Anytime you go into another country, you need a passport.
Absolutely, you need a passport to travel from one country to another.
You always need a passport to enter another country
Mauritius is one, The Philappines is another
As of June 2009, all persons returning to the US from another country are required to have a passport.
No, if you are in the United States, you will need to obtain a USA passport to go to another country or to return. Within the 50 states, you will not need a passport.
Not from another US State of Territory as long as you are a US Citizen.
if you are coming from another country then you will need a passport to go to the USA and in some cases you may also need a visa.
When traveling from one country to another, it is always required that you have your passport with you. This is done to ensure your safety and the safety of others.
You need a passport to go anywhere out of the country!