Why was the marshal law imposed in 1959?

There is no specific mention of martial law being imposed in 1959. If you are referring to a specific country or event, please provide more information for a more accurate answer.

The information you provided is unclear as there is no specific context mentioned. However, if you are referring to the imposition of martial law in a particular country in 1959, please provide the name of the country so that I can provide a more accurate response.