Athens and Sparta forming opposing alliances and

, are both causes of the Peloponnesian War. Whereas, Macedonia conquering all of Greece and
are effects of the Peloponnesian War.

Corrected response:

The formation of opposing alliances by Athens and Sparta was one of the causes of the Peloponnesian War. As tensions rose between the two city-states, they each sought to gather allies to strengthen their position. Athens established the Delian League, which consisted of various Greek city-states that pledged to protect one another from aggression. Sparta, on the other hand, formed the Peloponnesian League, which comprised mainly Peloponnesian states and aimed to counter the growing power of Athens. These opposing alliances further exacerbated the existing rivalry between Athens and Sparta, ultimately leading to the outbreak of the Peloponnesian War in 431 BC.

As for the effects of the Peloponnesian War, the most significant one was the eventual conquest of all of Greece by Macedonia. The war, which spanned for almost three decades, greatly weakened the major Greek city-states, especially Athens and Sparta. This power vacuum provided an opportunity for the emerging Macedonian kingdom, under the ambitious leadership of King Philip II and later his son Alexander the Great, to seize control. After the Peloponnesian War, Macedonia gradually expanded its influence and eventually conquered all of Greece, unifying the various city-states under its rule. This marked a turning point in Greek history, leading to the rise of the Macedonian Empire and the spread of Hellenistic culture throughout the ancient world.

The Peloponnesian War was a conflict between Athens and Sparta, which lasted from 431 to 404 BCE. There were several causes and effects of this war. Let's break it down step-by-step:

Step 1: Causes of the Peloponnesian War
- Athens and Sparta forming opposing alliances: Prior to the war, Athens, a dominant city-state in Greece, formed the Delian League, an alliance of several Greek city-states. Sparta, on the other hand, formed the Peloponnesian League with its allies. These opposing alliances created tension and competition between Athens and Sparta.
- Rivalry and power struggle: The rise of Athens as a naval power and its growing influence and dominance in the Greek world concerned Sparta and its allies, who feared the loss of their own power and autonomy. This rivalry fueled the conflict between the two city-states.

Step 2: Effects of the Peloponnesian War
- Macedonia conquering all of Greece: The Peloponnesian War weakened and destabilized both Athens and Sparta. As a result, a new power rose in Greece: Macedonia, led by King Philip II and later his son, Alexander the Great. Taking advantage of the weakened Greek city-states, Philip II conquered Greece and established his dominance in the region.
- Political and social upheavals: The Peloponnesian War caused significant political and social upheavals in Greece. It led to a decline in the power and influence of the city-states, including Athens and Sparta, and resulted in the loss of life, economic hardship, and destruction of infrastructure. The war changed the balance of power in Greece and reshaped its political landscape.

In summary, the opposing alliances formed by Athens and Sparta and the subsequent rivalry between them were primary causes of the Peloponnesian War. However, the war itself led to Macedonia conquering all of Greece and brought about significant political and social changes in the Greek world.