How do the people of South Asia protect themselves against Tsunamis?

I think there are many ideas to prevent tsunami waves hit lands. One of these ideas is build walls in coastal to be in horizontal position when ocean wave is normal. However, when ocean water level reduces due to tide and earthquakes. ... Then, these walls break the wave length and reduce the damage of tsunami.

Explanation:

answer; ///the above statement is (false);

answer; the residents of american samoa elect a nonvoting delegate to congress;