The US Department of State has just announced that there will be significant backlogs in immigrant visa availability for Chinese (mainland born) and Indian nationals who qualify under the Employment Based Second Preference Category, which is for people with an advanced degree education. The state department's cut off date is retroactive to March 23, 2012. Effective that date, no immigrant visas will be able for individuals who have a "priority date" of August 15, 2007. "AILA InfoNet Doc. No 12040447 (posted 4/4/2012)".
The priority date is generally established when an employer files a labor certification for an employee. An employee has to wait until his priority date comes up on the state department's visa bulletin before he can apply for the last step of the permanent residency process. Under this situation, it may take several years for Chinese and Indian nationals to obtain US permanent residency.
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