This is a formal essay, so do not use colloquialism like "Nowadays" or "way more".
If everything in your list except one is singular, then make that one singular. i.e. phone, electricity and transport.
Capitalize World War One and World War Two. Alternatively, use WWI and WWII. As this is a formal essay, spell out your numbers.
Developed
countries . Also, "developed" does not need to be capitalized.
The most advanced science they had became the most powerful nation in the earth
Whichever country that had the most advanced science became the most powerful nation on Earth.
And kill ,rob happened every corner
This does not flow at all. Watch your verb tenses too.
Comfort is the noun. Comfortable is the adjective.
Your second to last paragraph is riddled with sentence fragments. Try to connect some together, and add a subject/object to the ones lacking one.
People will never lost when we remember our root.
There are two ways to interpret this. Do you mean:
1. People will never get lost when we remember our roots.
OR
2. People will never lose when we remember our roots.
Both have different meanings.