অস্ট্রিয়ার হবু সম্রাট ও সম্রাজ্ঞী, আর্কডিউক ফার্ডিনান্ড এবং সোফিয়া, বসনিয়া সফরে যান। ২৮শে জুন, ১৯১৪ বসনিয়া-হার্জেগোভিনার সারায়েভো শহরে অস্ট্রিয়ার যুবরাজকে হত্যা করে সার্বিয়ার গ্যাবরিয়েল নামে এক নাগরিক জাতি হিসেবে সার্ব হওয়ায় অস্ট্রিয়া সার্বিয়ার থেকে বিচার চায়, সেই সাথে ক্ষতিপূরণ সার্বিয়া কিছু শর্ত মানলো, কিছু মানলো না। অস্ট্রিয়া ৪৮ ঘণ্টার আল্টিমেটাম দিলো এবং সময় ফুরিয়ে গেলে অস্ট্রো-হাঙ্গেরি ২৮শে জুলাই সার্বিয়ার বিরুদ্ধে যুদ্ধ ঘোষণা করে। অস্ট্রিয়াকে সরাসরি সাহায্য করে জার্মানি।
বিশ্বযুদ্ধের অন্যান্য কারণ
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আমাদের অল-ইন-ওয়ান মোবাইল অ্যাপের মাধ্যমে সীমাহীন শেখার সুযোগ উপভোগ করুন।
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