It helped conduce the development of city-states and civilizations in general. Writing is so ubiquitously useful that it'd be near impossible to describe the myriad of implementations it has. Some of the most beneficial uses would include:
1. The ability to archive information such as administrative statistics, history, and technology, as opposed to orally transmitting info which is comparatively inaccurate, transient, and not as flexible.
2. More accurate and greater ability to tax- an instrumental component of all civilizations.
3. Greater productivity in trade, agriculture, and manufacturing, as workers and merchants could now stipulate and meet quotas.
4. Helped expedite communication along great distances,
There are even more examples, but here are four:
1. Miscommunication, especially if he/she are second language speakers, this can cause a lot of problems.
2. Religion. Just imagine a Christian dating a Muslim. If they are both religious, a lot of fights could arise from this.
3. How you express yourself. In your culture, something might be more acceptable.
4. Food. The food you eat vs the food that is eaten in a different culture, that you might not approve of at all
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The change means that you can cross when its safe
They are becoming in easily because the highways are easy to go across but they need to make more roads and streets because it is really dangerous for cars to only go for so many streets