Bonjour, j'aurais voulu savoir si mon devoir est correct

I'm going to speak about space and exchanges. First let me try and give a simple definition of this notion.
Our world is built on the exploration and conquest of new spaces.
The different spaces of the world are nowadays more and more connected
So, This notion deals with interaction, between different spaces.
I'd like to illustrate this notion through an interesting topic, namely borderlands.
That is, the US-Mexico border.
Thus we may wonder what is stake of this border ?
I've chosen to divide my presentation into 2 parts.
Effectively, in a first part, we will see that it is a place very cross, so as to emigrate, and do legitimate businesses. In my last part, i will show that, it is a place, who stay a danger zone.

First of all, the US-Mexico border is one of the longest borders in the world.
It stretches over several states in the USA and is snakes from San Diego to brownsville, across all sorts of landscapes, from mountains to deserts.
Indeed, as mexico can only offer limited job oppostunities, many mexicans who are destitute dream of crosing the border to find sucess and better prospects in one of the wealthiest countries in the world.
That's why every day they are a lot of mexicans who try their chance.
Indeed, In a video, a journalist explained that there are about hundreds of people who is crossing the border every year.
Moreover, he Showed that there is a legal buisness who is thriving. It comes to 650 millions dollards.
given that it is place who is very crossing, they have a lot of security camera, and the border is guarded by more than twenty thousand Border Patrol agents. nevertheless, that can't stop from illegal trafic and illegal emigration.

Indeed, for instance, we have seen an extract from a narrative named "texas" from james michener. In this document, a group of Mexicans, including our main characters Manuela and Candido Guzman have decided to migrate illegally thanks to the help of smugglers. Sadly, the smugglers ditched them, and they suffered a horrible death. Candido seemed to have survived.
This extract highlights the danger who encounter a lot of emigrant.
Moreover there is several mexicans who try to pass a below the border.
It is more dangerous.
Indeed, there are drug traffic through tunnels . we can find about 2 tons of marijuana.

To conclude, i can say that the border is dangerous not only above, with several obtacles, for instance barbed wire, or borders patrols agents but also below with illegal trafic. I think that this situation become very serious and dangerous for a lot of people. It's time to react .