Articulation disorders, fluency disorders, and voice disorders.
True. This is because anything that prevents you from receiving and understanding a message, an idea or even a thought becomes a communication barrier. If at all a thick accent makes you not to understand what is being said, then that is a barrier to effective communication.
No, they cannot.
One of the requirements of being a president is to be born a citizen of the US.
Naturalized citizens are not born citizens of the US, but become them later in life: therefore they can't run for the president, or become vice-president, who is the person to become a president in the event of an assassination of the president.
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Answer: Discovery of Gold at Sutter's Mill and Cheap Land Prices
Explanation: Hope this helps <3