the cause and effects of these events. Each number in parentheses is how many sentences should be there.

In historical terms, every event has a cause, and is itself the cause of subsequent events, which may therefore be considered its effect(s), or consequences.Use parentheses to enclose information that clarifies or is used as an aside. Example: He finally answered (after taking five minutes to think) that he did not understand the question. If material in parentheses ends a sentence, the period goes after the parentheses.

they made rome the dominant power in the mediterranean.

2686-2181 bce-- "egyptian civilization developed along the nile river in large part because the river’s annual flooding ensured reliable, rich soil for growing crops."

1069-664 bce-- "ancient egyptians developed wide-reaching trade networks along the nile, in the red sea, and in the near east."