Table 2.

Interstate conflict before and after 1935.

The AmericasOutside the Americas
Mean
1816–1933
Mean
1934–2010
Difference in means
(t-value)
Mean
1816–1933
Mean
1934–2010
Difference in means
(t-value)
Dyadic MIDs per year0.01280.0008−3.1579***0.01000.0078−1.2846
Dyadic MID severity81.982755.2782−4.6512***78.625176.0006
−0.8347
Dyadic MID duration400.8557199.7320−4.0785***324.1755445.66075.3082***
The AmericasOutside the Americas
Mean
1816–1933
Mean
1934–2010
Difference in means
(t-value)
Mean
1816–1933
Mean
1934–2010
Difference in means
(t-value)
Dyadic MIDs per year0.01280.0008−3.1579***0.01000.0078−1.2846
Dyadic MID severity81.982755.2782−4.6512***78.625176.0006
−0.8347
Dyadic MID duration400.8557199.7320−4.0785***324.1755445.66075.3082***

Sources:  Gibler et al. (2016), Maoz et al. (2019), Palmer et al. (2021), and Goertz et al. (2023).

Notes: Excluding WWII years (1939–1945) yields similar results; duration is in days; *p < 0.10, **p < 0.05, and ***p < 0.01.

Table 2.

Interstate conflict before and after 1935.

The AmericasOutside the Americas
Mean
1816–1933
Mean
1934–2010
Difference in means
(t-value)
Mean
1816–1933
Mean
1934–2010
Difference in means
(t-value)
Dyadic MIDs per year0.01280.0008−3.1579***0.01000.0078−1.2846
Dyadic MID severity81.982755.2782−4.6512***78.625176.0006
−0.8347
Dyadic MID duration400.8557199.7320−4.0785***324.1755445.66075.3082***
The AmericasOutside the Americas
Mean
1816–1933
Mean
1934–2010
Difference in means
(t-value)
Mean
1816–1933
Mean
1934–2010
Difference in means
(t-value)
Dyadic MIDs per year0.01280.0008−3.1579***0.01000.0078−1.2846
Dyadic MID severity81.982755.2782−4.6512***78.625176.0006
−0.8347
Dyadic MID duration400.8557199.7320−4.0785***324.1755445.66075.3082***

Sources:  Gibler et al. (2016), Maoz et al. (2019), Palmer et al. (2021), and Goertz et al. (2023).

Notes: Excluding WWII years (1939–1945) yields similar results; duration is in days; *p < 0.10, **p < 0.05, and ***p < 0.01.

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