This depends on the time period but the only time that they spread their influence they didn't do it nicely so i would say the firearm ,"GUN" is the invention that helped them <span />
Answer:
it assured that they would be able to invade polond umproposed
Explanation:
A star<span> is a fusion reactor. Under enormous pressure, resulting from gravity, light nuclei of gases such as hydrogen merge to form helium, and since this </span>process <span>releases </span>energy<span>, the start begins to radiate the excess </span>energy<span>.</span>
