Could I please have a checking on what I wrote whether there's any errors?

There have so far been many military coups in this country, and the popular pretext for usurping power were always because of corruptions and the need to protect the monarchy.

But in fact, the main purpose of each coups were that the Amataya or conservative group feared that over years they have gradually lost their power, so they finally committed coups to retain their influence.

Each time after usurping power from the people, the junta always abolish the constitution, and then arbitrarily make a new one or mend the law in such a way that favour themselves.

And once they formed their own government, usually, they corrupt even more than ever before, and this time no one can check them of their administration and corruption.