Why did 28 countries come together?
The European Union came together after World War 2. The aim was to end the frequent and bloody wars between neighboring countries. In 1950 six European countries came together to create the Union. (Belgium, France, Germany, Italy, Luxembourg, and Holland)
Through out time the EU has grown and has added more and more countries. The most recent were Croatia in 2013 and Romania with Bulgaria in 2007.
What other international organizations do Portugal belong to?