If you have gone through a Schengen visa application, you would know how rigorous the process is; not to mention the number of documents that are required to prove your solvency and strong ties to your home country. Given this fact, a lot of countries trust this screening process and have come to acknowledge it as their own. Otherwise, other countries such as those found in Europe are in line to join Schengen so they are already accepting Schengen visas for entry into their borders.