In this modern era many countries teaching a foreign language to primary school students is mandatory. There are more merits than demerits.
Considering the benefits of learning a foreign language, in future students can pursue their carrer at abroad and gain more knowledge about field. As an example, in my brother school they teach international language thus when my want to do masters in computer science at USA it was easy for him to absorb knowledge from other language. Additionally, ones can travel around world without language barrier and misunderstanding. As a result, can travel with no worries and smoothly.
To hit the nail harder, knowing multiple languages can help to grow business globally and create new opportunity. As an outcome it will directly helpful to nation that will increase overall economy of country. Moreover, while knowing foreign languages the new doors open for youngsters and do overseas businesses. For instance, my neighbour knows the Chinese ergo it is easy for him to communicate with Chinese people for his business purpose and always get good deals.
To shed light on cons of learning overseas languages in primary school, first and foremost student who not want to study other language must study forcefully. As a result, students cannot do mastery in his favourite subject and may get lower grade. Secondly, person lost their cultural touch and there are higher chances they will confuse over multiple languages and cannot speak native language properly. To epitomise, a kid lives behind my house he cannot speal mother-tongue perfectly and take time to understand.
To draw the curtains, learning global languages will give more career opportunities. Besides it creates barriers with native culture.