Please review my IELTS essay.

TOPIC

A country becomes more interesting and develops more quickly when its population includes a mixture of nationalities.

To what extent do you agree or disagree?

Give reasons for your answer and include any relevant examples from your own knowledge or experience.

My essay

In these days and ages, it is undeniable that population plays an important role in the growth of every country. The wealthier people, definitely the more powerful nation. However, will the country become more exciting and develop more quickly if its population includes a mixture of nationalities. To some extent, I partially agree with this opinion.
First and foremost, it is without a doubt that the country will be always bustle and interesting when there are lots of types of nationality. Residents can easily share their cultural identities like traditional foods along with unique recipes or even table manners or social behaviors. For instance, Vietnamese always shake hands when they meet friends, while French usually kisses on the cheeks, so particularly different. Furthermore, the best advantage is that we can learn from others' knowledge and culture our mental development mutually.
One outstanding country that is the big fish the economy field now can be no one except the U.S.Besides, America succeed is almost subjects and now being the most diverse country in terms of population. In fact, Asian, African, European dwellers all have a huge number while Americans just take up a small part of the region, thus with an abundant population, we can claim that the U.S is one of the most advanced nations all over the world.
Unfortunately, problems are inevitable, the most complex one that hasn't any efficient solution for is racism. It happens everywhere although many people loath them due to a wide range of bad effects. Arguments of different people who do not resemble in the nation can lead to some annoying consequences like demonstrations, fightings, or even terrorism. Thereby, this terrible aspect must be inhibited and completely suppressed by governments.
In conclusion, it seems various population has its certain benefits but there are always complicated troubles which standstill besides. Therefore, it is necessary to prevent them scrupulously and definitively.