One of historical event had has major effect on VietNam

What historical event in your country has had a major effect on your country? Give reasons and examples to support your response.
There are many historical events in my country, but the event 30 April 1975 had a major effect on my country.
First, this was the day that Vietnam was entirely liberty and became a independent, liberty country.
Second, most of Vietnamese had changed their life in many ways. Some of them continued to live in VietNam and helped to contribute country that was destroyed by the war.
Also some of Vietnamese to looked for the way to go to abroad. They went to many coutries such as America, French, Germany, Russia….They faced a lot of difficult situations when they came to strange country. But they overcome and set up the stable life. Some of them have been successful now.
As a result, they have applied their achievements that they had after many years to live in many countries to come back Vietnam and develop their hometown.
On the other hand, there are some Vietnameses lost their family when they runaway from Vietnam. Because at that time, most of them come to abroad by over pass the border that was illegal. Likewise, some of Vietnamese lost their family when the regime changed. After 30 April 1975, some of them imprisoned and died in the jail. Thus they really wanted to revenge the regime that made their family to separate.
For these reason, the event 30 April 1975 has become a event that every person in Vietnam couldn’t forget in their life.