Yes. Quite clearly.
It can be seen from American countries south of Latitude 30 degrees.
All Year.
Actually I can; I have seen it often. But if you live too far north of the equator, the Southern Cross will always be below the horizon.
Yes. I saw it in April a few years back when I was staying at Silver Sands Resort on the south coast of Barbados. It was high enough in the sky that I could see all four stars. Really a thrill!