The last 50fifty years have seen an increasing number of immigrants to other countries.
....better use letter in essay writing
People moved due to a number of reasons, namely better educations or higher salary jobs
.... when you say "a number of reasons" you generally expects the number to be larger than two. So, let's say this a little differently;
People migrate to other countries due to various reasons, especially for educational and career purposes.Some peoplethoughtthink that they should follow the local customs in order to integrate into their adopted countries' cultures.
... this is an ongoing trend, so keep it in present tense, not past tense.
However I strongly believe that they are able to sustain their cultural identities and doing so help they can keep their origin values.
good thesis statement :)