Can I continue to apply for the American green card after it is interrupted?

The validity period of a visa for going abroad is generally 3 months, 6 months or other time, which is related to the type of visa, such as a ten-year visa; The length of time a visa stays in the country and place of entry is related to the type of visa. The general tourist visa is 7 days, 14 days, 30 days and 59 days. The number of valid visas can be divided into single validity and multiple round trips, such as five-year visas.

If a citizen wants to travel abroad, emigrate, study abroad, get married, etc. In addition to his passport, he must also hold the corresponding visa. Passport is the holder's nationality and identity certificate, and visa is the permission of a sovereign country to allow foreign citizens or their own citizens to enter, exit or transit. Visas are generally endorsed on passports, some are endorsed on other travel documents instead of passports, and some are issued separately. For example, the immigration visa in the United States is an application form, and Singapore also issues visas to foreigners separately, but it must be used at the same time as the passport to be effective. Generally speaking, foreigners are granted different entry visas according to the identity of the applicant and the purpose of entry, such as visas for traveling, visiting relatives, emigrating, studying abroad and working, and the residence time after entry is limited. Due to the different types of visas, the relevant materials needed are also different. Generally, short-term residence applications have fewer restrictions and shorter waiting time for approval. For the purpose of job hunting and long-term residence, it has become a common practice in all countries to apply for more restrictions and wait for a long time. A country has no obligation to allow foreigners to enter the country unconditionally (unless there is a treaty), and a foreigner has no right to ask a government to allow him to enter the country. The entry of foreigners is conditional. In recent years, with the development of international trade, international political relations and the prosperity of tourism, visa regulations in many countries tend to be simplified. There are also agreements between countries to exempt or simplify visa procedures /zd/xx.