Your US passport is considered an official document that is issued to you by the US Government. It is a document that proves your identity and citizenship. It is also is considered as your international travel document so that the holder can travel to different destinations and return safely to US. If you are holding a valid US passport then you are allowed to enter most foreign countries. There are a number of US citizens who in fact hold dual citizenships so they are allowed to have a second passport in the other country that they have citizenship in. Having a dual citizenship might have its own advantages and disadvantages as most countries simply do not hold it legal, but the US allows you to hold a valid dual citizenship.
If you are a citizen of US then you have every right to apply for a valid US passport to be able to travel abroad. There are a number of people who apply for an US passport because they need a visa for entering a foreign land for business purposes. Obtaining a visa is simply not possible without holding a valid US passport. There are also a number of countries that ask you to hold a valid US passport for entering or leaving that country. Having a valid US passport is enough for entering and leaving some countries, however there are certain countries that will require you to have a visa as well as a passport.
Even if you are staying in US you certainly need to hold a valid US passport if you have to travel to destinations like Canada, Bermuda, Mexico, South and Central America and Caribbean and other international destinations. This holds true for all land, sea and air borders. In case you want to obtain a new passport the procedure might just take time but if you are already holding a US passport then the process accelerates. Whenever traveling it is necessary that children have their own US passport. Even if you are an American citizen still you might be requested to provide a copy of your US passport when traveling to any foreign destination. This acts as your identity proof when traveling in foreign land.
This is generally looked as a safety measure as your US passport can also permit you to enter US consulate at the time of an emergency. You can always apply for your US passport online over the internet but you have to keep in mind that you will never be issued a passport online as only the US Government has the right to issue you a valid passport. You can simply try to fill the application form and submit a copy of your document online but you might have to visit the regional passport office to get all the documents verified and to obtain your US passport, which generally is mailed at your residential address.
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