自上个世纪90年代以来,全球各地区以及跨地区的区域一体化协议(RIA)不断增加,其一体化的深度也不断加强。欧洲共同体已发展成为单一市场,并于1999年诞生了欧元,采用了共同的货币。与此同时,欧盟外的其他欧洲国家都在积极申请加入欧盟,欧盟已接纳东欧十国。在美洲大陆,有北美自 Since the 1990s, the regional integration agreements (RAs) of various regions and regions across the world have been steadily increasing and the depth of their integration has also been steadily growing. The European Community has evolved into a single market and the Euro was born in 1999 with a common currency. In the meantime, other European countries outside the EU are actively applying to join the EU, and the EU has accepted 10 Eastern European countries. In the Americas, there is North American since