In the sites of Harappa and Mohenjo-Daro, archeologists have found a high degree of standardization of weights, measures, architectural styles, and even brick sizes. Such standardization may suggest that

There might have been a central authority powerful enough to reach all corners of the society.

Explanation:

Harappa and Mohenjo-daro became the two great cities found in the Indus Valley Civilization. Harappa was known to be the first city in that region that archaeologists found. It was in the discovery sites of Harappa and Mohenjo-Daro, that archeologists found a high degree of standardization of weights, measures, architectural styles, and even brick sizes.

Therefore, this implies that there might have been a central authority powerful enough to reach all corners of society.

The Harappans became the first to develop a system of uniform weights and measures. These weights and measures conformed to a successive scale.

well it depends i think people around the world are coming around to gay marriage. but if you are talking abortion then wow, so much to talk about. such as men thinking they have the right to choose if women can, the fact there are health concerns if the women can't get one, and many more arguments to discuss. so i would definitely say abortion would be a much more interesting topic.