I think this would be the Great Wall of China!
although it's actually thought to be much, much longer: over 5000 miles long, if yoiu include natural defensive barriers used in it.
"Sulla<span> took control of </span>Rome<span> in late </span>82<span> and early 81 BC after victories in the civil war of his own making, and those of his chief legate Pompeius Magnus. ... </span>Sulla<span> not only butchered the constitution through various reforms he would make, but also focused his power on the leading members of the Roman ruling </span>classes<span>." This quote should help!</span>
Answer: Spain
Explanation: Christopher Columbus was sent to India by King Ferdinand & Queen Isabella. Instead of taking the normal route Christopher tried to go across the world. And ended up in North America & later reaching South America. When King heard there was gold he sent many men to take over the new land conquering Central America, portions of the Caribbean & larger portions of South America