I think Mangas is the right answer!
It closed down all trade routes to Asia.
Answer:
The Communal Award, announced by Ramsay MacDonald on 16 August 1932, ensured the retention of separate electorates for Muslims, Sikhs and Europeans, and considerably increased the limited number of provinces that offered, under the Government of India Act of 1919
Answer:
A constitutional amendment is a modification of the constitution of a polity, organization or other type of entity. Amendments are often interwoven into the relevant sections of an existing constitution, directly altering the text.