The correct answer is "accepting converts to Islam".
They were the first that started creating a universal Islam identity instead of just catering to the needs of Arabs. Many non-arabic persons started speaking Arabic languages and the spread of the Arabian culture had many people convert to Islam.
Its both cause you will never know
The one that describes Johnson's vietnam war strategy is : Committing large amount of American Troops to the fight and massive bombing
By doing this, Jhonson expect to capture a target area as fast as possible while eliminating the chance of lost in numbers.
hope this helps
not enough Americans was working making shops go bankrupt.