USA has a Visa Policy and in the policy it says that The U.S is an open country that anybody can visit and do business or can have study. They are dedicated to protect people’s safety both USA citizens and visitors so they are following some rules and very careful about keeping the doors open! The rules sometimes changes but thats not because to make it more difficult. Their goals in changing rules about visas is ensuring safety of U.S. residents and visitors of U.S.
The following text from U.S visa department;
The U.S. is a free and open society. We welcome citizens from around the world who genuinely want to visit, study, and do business here. We are dedicated to protecting their safety and keeping our doors open to them. Changes in visa procedures reflect our concern for ensuring the safety of U.S. residents and visitors alike, not to make it more difficult for legitimate travelers to enter the United States.
Following the terrorist attacks of September 11, 2001, we made some changes in our laws governing visitor entry and exit.
We now require additional application forms and security clearances. Visa applications take longer to process.
At first, many applicants experienced hardship when applications got backlogged and delays became indefinite. Fortunately, we have improved our visa clearance procedures. Better interagency cooperation and automated procedures have speeded up the clearance process. Our goal is to make the visa process not only thorough, but also respectful and efficient.
There are some new procedures that you will need to become familiar with. We want to educate and inform you about this process.